The ks.cfg file generated by mkkickstart shipped with redhat-6.2 does not
work with the redhat-6.2 installer. Some problems include:

network --static should be network --bootproto static
mouse genericps/2 should be mouse --device psaux

Also - the kickstart documentation is flawed in two places - I don't know
where to send the bug report so I guess I'll do it here. First of all, the
"cdrom" option does not work, kickstart reports that it wasn't given an
install source method or some such nonsense. I can only get nfs to work.
Secondly, the documentation doesn't say in what units the partition sizes
should be.